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Tenth Conference on Electromagnetic and Light Scattering
June, 17-22, 2007, Bodrum, Turkey

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat


ISBN Print: 978-1-56700-244-7

Backscattering linear depolarization ratio of laboratory generated ice clouds composed of pristine and complex-shaped ice crystals

pages 193-196
DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.510
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ABSTRACT

Artificial ice clouds have been generated in the laboratory by using the large cloud simulation chamber AIDA of Forschungszentrum Karlsruhe. Experiments have been conducted in the 0C to −30C temperature range. Temperature and saturation ratio regimes with distinct predominating ice crystal habits in a varying ice crystal complexity could be identified by probing the ice clouds with a contact-free, single particle imaging device developed in our institute. Backscattering linear depolarization ratio measurements have been performed on the overall ice cloud simultaneously to single ice crystal characterization. A clear dependence of the linear backscattering depolarization ratio on the ice crystal habit was observed. Ice clouds composed predominantly of compact columnar crystals exhibit a higher depolarization ratio than clouds composed of thin plate-like crystals. Ice crystal growth at high ice saturation ratios increases the particle complexity and lowers the depolarization ratio.

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